Stylus-bar attachment for phonographs



A. F. GILLET.

STYLUS BAR ATTACHMENT FOR PHONOGRAPHS.

APPLICATION FILED JULY 14, 1920.

1,375,750. Pafent d Apr. 26, 1921.

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UNITED STATES PATENT OFFICE.

ALEXIS F. GILLE'I', OF OMAHA, NEBRASKA, ASSIGNORTO JUBILEE MANUFACTURINGCOMPANY, OF OMAHA, NEBRASKA, A CORPORATION.

Specification of Letters Patent.

Patented Apr. 26, 1921.

Application filed July 14, 1920. Serial No. 396,263.

T 0 all whom it may concern Be it known that I, ALExIs F. GILLET, acitizen of the United States, residing at Omaha, in the county ofDouglas and State of Nebraska, have invented certain new and usefulImprovements in Stylus-Bar Attachments for Bhonographs, of which thefollowing is a specification.

This invention relates to an improved mounting for the stylus upon thestylus bar of a phonograph to eliminate the harsh tones usually causedby undue vibration of the stylus while engaging in the spiral groove ofa disk record, and to soften or modify the tone usually produced by themetallic parts which engage the diaphragm of the sound box. One of thespecific objects of the invention is to provide an at tachment for thestylus bar for the purposes mentioned which will be so constructed thatit will not prevent the stylus from being disposed in alinement with thestylus bar. Another specific object is to provide a sleeve orcylindrical filler of shock-absorbing material which will uniformlymodify the vibrations, said sleeve to have such a mounting that it willeffectively prevent a contact of any of the metallic, supporting partsof the stylus with the stylus-bar.

The invention consists of the novel construction, combination andarrangement of parts as described herein and claimed, and as illustratedin the accompanying drawing, wherein,

Figure 1 is a plan view of the sound box, the stylus bar and theattachment thereon. Fig. 2 is a side view of the same, a part of a diskrecord being added. Fig. 3 is a side view of the attachment. Fig. 4 is afront end View of the parts shown in Fig. 3. Fig. 5 is a view inlongitudinal section showing the metallic, cylindrical casing, themetallic cylindrical core, the stylus and the sleeve or filler forabsorbing vibration. Fig. 6 is a rear end view of the attachment.

The invention is described in connection with the sound box 7 and stylusbar 8 con-- nected with the diaphragm 9 of a phonograph, and in orderthat vibrations may be modified which are communicated to the diaphragmfrom the stylus bar and occasioned by engagement of .the stylus 10 withthe disk record 11, I provide the attachment 12 for the stylus bar forholding the stylus.

The attachment consists of a filler-block 13 of vibration absorbingmaterial, a cork sleeve a surrounded by a sleeve 6 of india rubber beingshown in the present instance, but other non-metallic substance orsubstances may be substituted if desired, a metallic, cylindrical casing14 being employed as a holder for the filler-block 13, the curved sidesas of the casing terminating adjacent to each other at its top, and itslower side being provided with an angular shank 15 having a terminal 0disposed in line with the longitudinal axis of the cylindrical filler 13for a mounting in the aperture (not shown) of the stylus bar.

Numeral 16 indicates a cylindrical, metal- 110 core, provided centrallywith a recess for holding the stylus 10 and adapted to fill the apertureof the sleeve a, and it will be seen that the stylus when mounted in itsholder will be disposed in line with the terminal 0 of the shank of thecasing 14.

The sleeve Z2 is preferably provided with .a ridge 9 adapted to bedisposed between and to engage the ends of the curved sides 00, whichprevents any revoluble movement of the cylindrical block 13 relative tothe cylindrical casing 14, and by means of a setscrew 17 which traversesthe sleeves a and b and ridge 6 and which is threaded in the metalliccore 16, the stylus may be socured stationary with the recessed core, ormay be released therefrom.

The convexed surface of the sleeve b is provided with corrugations asindicated at 18, and since only the-ridges of the corrugations will makecontact with the metallic holder or casing 14, this feature operates tomodify the vibrations communicated to the stylus bar from the stylus;and in operation, since the sleeves a and I) provide a medium for thecommunication of vibration from the stylus to the stylus bar, all harshsounds caused by excessive vibration and generally occasioned byimperfect styli or imperfections in the grooves of disk records will bepractically eliminated.

It is considered that one feature of advantage which will be appreciatedin the use of the herein described attachment is the fact that thestylus will bemaintained in line with the axes of the stylus and stylusbar. It will be noted that the parts employed are of such simpleconstruction that they may be conveniently produced and may be readilyassembled; also that the provision of the ridge 6 for the sleeve 6 willprevent contact of the set-screw with the metallic casing, whichotherwise might accidentally occur.

While I have shown two resilient sleeves a and b of vibration-absorbingmaterial and prefer this construction, this feature is not necessary tooperation, and I may use a single sleeve; also I may change details ofconstruction and size, form and proportion of parts, such changes to bewithin the sco e of the invention as claimed.

claim:

1. In a stylus bar attachment for phonographs, a metallic, c lindricalcasing open at one side and provi ed opposite to its open side with anangular shank for engaging the stylus bar, a metallic core centrally ofsaid casing, a stylus in line with the axis and carried by said core, asleeve of vibrationabsorbing material between the metallic core andcasing, and a set-screw between the sides of the casing traversing thesleeve and metallic core for engaging the stylus, said angular shankhaving a terminal adapted to be disposed in line with the stylus andstylus bar.

2. In a stylus bar attachment for phonographs, a metallic casing open atits ends, a recessed, metallic core in the casing, a stylus in therecess of the core, a sound-absorbing body in the casing encircling thecore, said body having numerous ridges for engaging the casing andhaving numerous grooves to lie adjacent to the casing, said casing beingprovided with a shank having a terminal disposed in line with the stylusand adapted to be mounted upon the stylus bar in line with the axis ofsaid bar.

3. In a stylus bar attachment for phonographs, a metallic, cylindricalcasing open at one side and provided opposite to its open side with anangular shank, a recessed, metallic core centrally of said casing, astylus in the recess in line with the axis of said core, a sleeve ofsound absorbing material outwardly of said core having ridges engagingthe casing, and a metallic keeper between the sides of the casingtraversing the sleeve and metallic core for engaging the stylus, saidangular shank having a terminal adapt ed to be mounted upon the stylusbar in alinement with said stylus and stylus bar.

4. In a stylus bar attachment for phonographs, a cylindrical sleeve ofsound absorbing material provided longitudinally with a ridge and havinga metallic, recessed core disposed longitudinally thereof at its middlefor holding a stylus, a casing having curved sides adapted to enga e theperiphery and abut upon the ridge of? said sleeve, a keeper engaging insaid sleeve and ridge and threaded in the core for a contacting relation with the stylus, said casing having a part disposed in alinementwith the recess of the core for an alining position with the stylus barwhen mounted on said bar.

5. In a stylus bar attachment for phonographs, a recessed, cylindrical,metallic core for holding a stylus, a sound absorbing sleeve encirclingthe core and provided longitudinally with numerous ridges, a casingmounted non-revolubly upon and having curved sides adapted to engage theridges of the sleeve and having a part disposed in alinement with therecess of the core for an alining. position with the stylus bar whenmounted on said bar.

In testimony whereof, I have afiixed my signature in presence of twowitnesses.

ALEXIS F. GILLET. lVitnesses:

ARTHUR H. STURGES, HIRAM A. STURGES.

